<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body onclick="alert(1)" >
    <div style="height: 300px;background-color: #ccc;">111111111
        <div  style="height: 200px; background-color: blue;">222
            <div  style="height: 100px; background-color: red;">33333333

            </div>
        </div>
    </div>
</body>
</html>